|Jyoji "Geo" Omori|
|Style||Brazilian jiu-jitsu, judo|
|Notable students||Luiz França|
After moving to Brazil in 1925, he taught Jiu Jitsu and Judo in Rio de Janeiro, and in 1931 he opened a school in São Paulo in Edificio Martinelli, the first skyscraper in Brazil. Omori is considered instrumental in the foundation of Brazilian jiu-jitsu by establishing the first Jujitu school in São Paulo. He would later instruct another key Brazilian Jiu-Jitsu founder Luiz França. His other student included Carlos Pereira.
Omori was one of the first prominent mixed martial arts competitors of his era. He helped to initiate the Vale Tudo trend of the 1920s and 1930s in Brazil. Geo had an extensive fight history engaging fighters of various styles including capoeira, boxing, and wrestling. A 1928 issue of The New York Times highlighted one of his fights against a "negro" capoeira fighter, in which Geo Omori won. He fought many members of the Gracie family including George Gracie and Carlos Gracie. His feud with Carlos Gracie is well documented. His death in 1938 was attributed to food poisoning.
- BJJ Heroes. "Luiz Franca - BJJ Heroes: the jiu jitsu encyclopedia". BJJ Heroes: the jiu jitsu encyclopedia.
- Martial Arts of the World: An Encyclopedia of History and Innovation, Volume 2 edited by Thomas A. Green, Joseph R. Svinth
- Serrano, Marcial (2010-02-14). O Livro Proibido Do Jiu Jitsu (in Portuguese). Clube de Autores.
- "History of Brazilian Jiu Jitsu". aloisiosilvabjj.com.
- "MMA HALL OF FAME Nominee » Geo Omori". mmahalloffame.com.
- "Chapter 6. O Jiu-Jitsu Como Profissão". global-training-report.com.
- "Bloody Elbow Book Review: Catch Wrestling Round Two by Mark Hewitt". Bloody Elbow.
- "GÉO OMORI - "O Guardião Samurai", por Marcial Serrano - agBook - O seu livro Publicado 100% gratuito e sob demanda". agbook.com.br. Retrieved 2019-02-16.
- Martial Arts of the World: An Encyclopedia of History and Innovation, Volume 2, edited by Thomas A. Green, Joseph R. Svinth, p. 33.
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